ABSTRACT
Maintaining adequate core cooling during any operating condition is a principal consideration in reactor design. There are two requirements that must be met to ensure adequate cooling: first, a proper coolant inventory must be maintained; and second, decay heat must be removed to the ambient. This chapter describes systems that ensure that core cooling requirements are met. These systems were initially designed to cope with loss of coolant and loss of flow accidents. Together with certain supplementary features they also cover other accident sequences that could lead to core damage and that could be more probable in certain plants.
